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What causes no fuel and air blows out the top of the carbs when cranking on my 2007 650 brute force, very low milage machine that has been sitting for 6 to 7 years
 

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Stuck or leaking valves or jumped timing. I suggest if it's been sitting that many years all the lube has left the valve stems and guides so pulling the covers and spraying some light lube like WD or PB on then as well as down the intakes to the exposed stems for the intakes and..for the exhausts may have to pull the pipes to get to those. Check the valve timing first though.
 
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